JPH11257605A - Atomized burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the ignition performance of an atomized burner. SOLUTION: An atomized burner includes a heat chamber 62 which mixes a fuel atomized by a spray nozzle 50 and air and burn the mixture and a stabilizer 64 which constitutes a bottom portion of the heat chamber 62. The stabilizer 64 is provided with a central hole 66 formed in the central portion of a plate body, a plurality of air communication holes 67 formed around the central hole 66 and swirl vanes 68 erected in an inclined manner from the brim portions of the communication holes 67. Due to such a construction, the fuel is sprayed into the inside of the heat chamber 62 from the atomized nozzle 50 and due to an action of the swirl vanes 68, the air which flows in the inside of the heat chamber 62 through the communication holes 67 forms a swirling flow thereof. In this case, the end portions of the swirl vanes 68 at the central hole 66 side are formed as bent portions 86 extending toward the plate body side so as to close or narrow the gap between the end portions of the swirl vanes 68 at the central hole 66 side and the plate body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray combustion type burner, and more particularly to a spray combustion type burner provided with a stabilizer for generating a swirling flow in a combustion cylinder.

[0002]

2. Description of the Related Art Conventionally, a combustion cylinder for mixing and burning fuel and air sprayed from a spray nozzle, a center hole formed in the center of a plate body, which is a member constituting the bottom of the combustion cylinder, A plurality of air passage holes formed radially around the air passage, and a stabilizer provided with swirling vanes rising obliquely from an edge of the air passage hole. There is known a spray combustion type burner which is caused to flow into a combustion cylinder through a through hole and to generate a swirling flow of air flowing into the combustion cylinder through a passage hole by the action of the swirling blade.

FIG. 5 shows an example of this type of burner. In the figure, reference numeral 200 denotes a combustion cylinder, and reference numeral 202 denotes a stabilizer constituting the bottom thereof. The stabilizer 202 is formed of a plate, and has a circular center hole 204 formed at the center thereof. A central hole 204 is formed in the stabilizer 202 by partially cutting and raising the plate body.
And a plurality of air passage holes 206 at positions surrounding the air passages, and the swirl vanes 2 standing upright from edges of the air passage holes 206.
08 is formed radially, and the secondary air guided through the secondary air chamber 210 passes through the passage hole 206 and flows vigorously into the combustion cylinder 200. By the action, a swirling flow of air is generated in the combustion cylinder 200.

[0004] The secondary air chamber 210 is formed between the plate of the stabilizer 202 and the tapered partition 212. The tapered partition wall 212 has a central hole 204
The diameter of the outer diameter is increased as it advances in the axial direction from the peripheral edge, and the outer peripheral end is in contact with the cylindrical body 214.

The outer peripheral wall of the secondary air chamber 210, specifically, the front part of the cylindrical body 214 is provided with a secondary air hole 21 as an inlet.
6 is formed, and is sent out by a blower to form a cylindrical body 21.
4 enters the secondary air chamber 210 through the secondary air hole 216, flows through the secondary air chamber 210, and passes through the passage hole 206 of the stabilizer 202.
From the cylinder 200.

A spray nozzle 220 and an electrode rod 222 are provided in a primary air chamber 218 in the cylinder 214. A primary air hole 224 is also formed in the outer peripheral wall of the primary air chamber 218, that is, in the cylindrical body 214, and a minute amount of primary air is supplied to the primary air chamber 218 from the primary air hole 224. And under that small amount of primary air flow,
Spraying of fuel (here, petroleum fuel) from the spray nozzle 220 and discharge by the electrode rod 222 are performed, and the combustion cylinder 200
Fuel is ignited within.

[0007]

In this type of spray combustion type burner, the stabilizer 202 is provided with the combustion cylinder 20.
In the combustion cylinder 200, a swirling flow is generated within the combustion chamber 200, and the fuel and air sprayed from the spray nozzle 220 are mixed well to stabilize the combustion. Specifically, there is a disadvantage that the stability of ignition is impaired by the action of the swirling blade 208.

In order to stably ignite, the electrode rod 2
It is desirable that the arc P by the nozzle 22 extend long inside the combustion cylinder 200. However, in the case of the stabilizer 202 having the conventional structure, when the air passes through the passage hole 206, a part of the center hole 204 is guided by the swirling blade 208. An air flow is produced towards the side, i.e. towards the center, and this air flow causes the disturbance of the arc P.

[0009]

The invention of the present application has been made to solve such a problem. According to a first aspect of the present invention, there is provided a burner for mixing and burning fuel and air sprayed from a spray nozzle, and a center hole formed in a central portion of the plate body, the member being a bottom part of the combustion cylinder. And a stabilizer provided with a plurality of air passage holes formed around the center hole and swirling vanes rising obliquely from an edge of the passage hole, and spraying fuel from the spray nozzle into the stabilizer. In the spray combustion type burner, which flows into the combustion cylinder through the center hole and generates a swirling flow of the air flowing into the combustion cylinder through the passage hole by the action of the swirling blade, the sprayer burner may be arranged on the side closer to the center hole of the swirling blade. Is bent to the plate body side to close a gap between the center hole side end of the swirl vane and the plate body or to make the gap narrower than other portions.

[0010] The burner according to claim 2 is the burner according to claim 1,
A primary air chamber is provided on the upstream side adjacent to the combustion cylinder, the spray nozzle is housed in the primary air chamber, and the primary air chamber also serves as a front wall or the front wall. Is separately provided, and a secondary air chamber communicating with the passage hole is defined between the primary air chamber and the stabilizer and around the center hole by a partition extending outwardly from a peripheral edge of the center hole. It is characterized by being.

The burner according to claim 3 is the burner according to claim 2,
The partition has a tapered shape that expands in diameter in a direction away from the peripheral edge of the center hole and has an inlet for secondary air formed in an outer peripheral portion of the secondary air chamber. The secondary air is guided to the passage hole of the stabilizer through the secondary air chamber.

[0012]

As described above, in the burner according to the first aspect of the present invention, the end of the swirling blade on the side of the center hole is bent toward the plate body so that the end between the center hole side end of the swirl blade and the plate is formed. According to the present invention, the flow of air toward the center hole through the passage hole of the stabilizer can be suppressed, and the air flow toward the center hole can be used for ignition. Can be solved. As a result, the ignition performance can be improved, and at the same time, by suppressing the flow of air toward the center hole, the momentum of the swirling flow in the combustion cylinder can be increased, whereby the combustion at the time of combustion after ignition Stability can be further improved.

According to the present invention, a primary air chamber is provided on the upstream side adjacent to a combustion cylinder, that is, a combustion nozzle, and a spray nozzle is accommodated in the primary air chamber. The extended partition wall can be suitably applied to a burner in which a secondary air chamber on the stabilizer side defined by the primary air chamber is defined (claim 2). In this burner, when the secondary air is supplied to the stabilizer through hole vigorously, it is possible to prevent the supplied air from flowing into the primary air chamber vigorously and thereby hindering the stability of the arc at the time of ignition.

The present invention is particularly effective when applied to a burner having a tapered shape in which the partition wall increases in diameter as the distance from the center hole periphery of the stabilizer increases in the axial direction (claim 3). In the case of the burner of this mode, the air introduced from the inlet at the outer peripheral portion of the secondary air chamber is flow-guided in the center direction by the tapered partition through the passage hole of the stabilizer.
The flow of air toward the center hole is likely to occur, but according to the present invention, this can be favorably suppressed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 denotes an oil water heater, which has a burner 14 inside a housing 12. Reference numeral 16 denotes a water supply port in the oil hot water heater 10, and reference numeral 18 denotes a tap hole.

A flow sensor 22, a water supply thermistor 24, and a water amount control valve 26 are provided on a pipe 20 following the water supply port 16, and mixing is performed on a pipe 30 from the heat exchanger 28 to the tap 18. A tank 32 and an overpressure relief valve 34 are provided. The heat exchanger 28 is provided with a heat exchanger thermistor 36. Reference numeral 38 denotes a drain plug.

Numeral 40 denotes a combustion chamber, in which the water supplied through the pipe 20 is heated by the heat exchange action of the heat exchanger 28 and the heat of combustion in the combustion chamber 40 to be turned into hot water.
Hot water is supplied from the tap 18. Reference numeral 42 denotes an exhaust port.

The burner 14 is of a gun type, and as shown in FIG. 2, a blower 44 for supplying air, a fuel pump 46 for delivering fuel (oil fuel), a solenoid valve 48, The fuel pump includes a spray nozzle 50, an electrode rod 52, and an igniter 54. The fuel delivered by the fuel pump 46 is sprayed from the spray nozzle 50 and burned.

Here, the fuel pump 46 is of a variable discharge pressure type, that is, capable of continuously changing the fuel supply amount. That is, the burner 14 in this example is a burner whose combustion amount is variable. 56 (see FIG. 1) is an oil strainer, 58 is a flame detector (CdS), and 60 is a controller for controlling various operations.

FIG. 3 is an enlarged view of a main part of the burner 14. In the figure, reference numeral 62 denotes a combustion tube, and 64 denotes a stabilizer constituting the bottom thereof. Stabilizer 64
Has a circular center hole 66 at the center.

Further, a plurality of air (secondary air) passage holes 67 (see FIG. 4) are formed by partially cutting and raising the plate body, and the swirling vanes 6 standing upright from the edges of the respective passage holes 67.
8 are formed radially around and adjacent to the center hole 66, and the air flowing through the secondary air chamber 70 passes through the passage holes 67 and flows into the combustion cylinder 62. A swirling flow is generated in the combustion cylinder 62 by the action of the swirling blade 68.

In FIG. 4B, reference numeral 72 denotes a tapered partition wall plate, and the secondary air chamber 70 is provided with a stabilizer 6.
4 is formed between the plate body and the partition plate 72. The partition plate 72 extends from the peripheral edge of the center hole 66 of the stabilizer 64, and its diameter increases as it advances in the axial direction, and its outer peripheral end is in contact with the inner surface of the cylindrical body 74.

The cylindrical body 74 is provided with a secondary air hole (secondary air inlet) 76 communicating with the secondary air chamber 70 between the partition plate 72 and the stabilizer 64. Is supplied to the inside of the secondary air chamber 70 through the secondary air hole 76, furthermore, flows through the secondary air chamber 70, and is supplied from the passage hole 67 of the stabilizer 64 to the inside of the combustion cylinder 62. Note that a tertiary air hole 78 is formed in the combustion cylinder 62, and a part of the air sent from the blower 44 is also transmitted from the tertiary air hole 78 to the combustion cylinder 6.
2 is supplied inside.

A primary air chamber 80 is formed inside the cylindrical body 74, and houses the spray nozzle 50 and the electrode rod 52 therein. A primary air hole 82 (see FIG. 3) is also formed in the outer peripheral wall of the primary air chamber 80, specifically, in the cylindrical body 74, and a part of the air sent from the blower 44 is used for the primary air. The fuel is injected from the spray nozzle 50 and discharged from the electrode rod 52 under the primary air flow inside the primary air chamber 80 through the hole 82 and under the primary air flow inside the primary air chamber 80, and the combustion cylinder 62 The fuel is ignited inside.

In this embodiment, the air sent from the blower 44 reaches the annular chamber 84 in FIG. 3, and further passes therethrough through the primary air hole 82, the secondary air hole 76, and the tertiary air hole 78, respectively. Thus, the air is distributed and supplied into the primary air chamber 80, the secondary air chamber 70, and the combustion cylinder 62, respectively.

As shown in FIG. 4, each turning blade 68
The end of the center hole 66 side is a bent portion 86 toward the plate body side (the right side in the same figure (C)), and at the end of the center hole 66 side of each turning blade 68, the turning blade 68 The gap between the and the plate is closed. The bent portion 86 at the end of the swirling blade 68 on the side of the center hole 66 may be formed into a bent shape such that a minute gap is left between the bent portion 86 and the plate.

In the case of the burner 14 of this embodiment, the secondary air chamber 70
From the center hole 66 through the through hole 67 of the stabilizer 64
The flow of air toward the side is favorably suppressed by the bent portion 86 at the end of the swirling blade 68.

Therefore, according to this embodiment, at the time of fuel ignition, the disturbance of the arc P from the electrode rod 52 due to the flow of air toward the center hole 66 is suppressed, and the ignition performance is improved. In addition, even during normal combustion, the flow of air flowing toward the center hole 66 is converted into the original swirling flow, so that the swirling flow itself becomes stronger and the combustion stability is further improved. Can be

Although the embodiment of the present invention has been described in detail, this is merely an example. For example, the burner 14 in the above example is merely an example of the present invention, and the present invention can be applied to burners of other forms. It can be configured in a modified form.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an oil water heater including a burner according to one embodiment of the present invention.

FIG. 2 is a diagram specifically showing a configuration of a burner in FIG.

FIG. 3 is an enlarged sectional view showing a main part of the burner in FIG. 2;

FIG. 4 is an enlarged view showing the stabilizer and its peripheral portion in FIGS. 1 to 3;

FIG. 5 is an enlarged view showing a main part of a conventional burner.

[Explanation of symbols]

 14 Burner 50 Spray nozzle 62 Combustion cylinder 64 Stabilizer 66 Center hole 67 Passage hole 68 Swirling vane 70 Secondary air chamber 72 Partition plate 74 Cylindrical body 76 Secondary air hole 80 Primary air chamber 86 Bent portion

Claims (3)

[Claims] 1. A combustion cylinder for mixing and burning fuel and air sprayed from a spray nozzle, a center hole formed in a central portion of a plate body as a member constituting a bottom of the combustion cylinder, A plurality of air passage holes formed therearound and a stabilizer provided with swirling vanes rising obliquely from an edge of the passage hole, and spraying fuel from the spray nozzle through the center hole of the stabilizer. In the spray combustion type burner which flows into the combustion cylinder and generates a swirling flow of the air which has flowed into the combustion cylinder through the passage hole by the action of the swirling blade, the end of the swirling blade on the side of the center hole is formed by the plate. A spray combustion type burner characterized in that the gap between the end of the swirling vane on the side of the center hole and the plate body is closed or the gap is narrower than the other portions. 2. The primary air chamber according to claim 1, wherein a primary air chamber is provided on an upstream side adjacent to the combustion cylinder, and the spray nozzle is housed in the primary air chamber. A partition wall that also serves as a wall or is provided separately from the front wall and communicates with the passage hole between the primary air chamber and the stabilizer and around the center hole by a partition wall that extends outward from the periphery of the center hole. A spray combustion type burner characterized in that a secondary air chamber is formed so as to be divided. 3. The secondary air chamber according to claim 2, wherein the partition wall has a tapered shape whose diameter increases as the distance from the peripheral edge of the center hole increases in the axial direction, and an inlet for secondary air is provided at an outer peripheral portion of the secondary air chamber. A spray combustion type burner, which is formed, wherein secondary air from the inlet is guided to a passage hole of the stabilizer through the secondary air chamber.